SEO with this sort of video is really trends and algorithm changes if i'm not mistaken - interest in these videos tends to be mostly random if it's a more popular musician (keywords, thumbnail and CTR are really only drivers tbh) - anything you reckon would work?
Man, your videos are so high quality, and I want to see you succeed. I strongly suggest you redesign your channel homepage. If you go to the home tab, it says your channel doesn't have any content, which of course isn't true. I'd suggest putting a favorite video of yours as the channel trailer and then putting up simply your uploads and maybe the most popular vids. Another great video man!
